The && converts to &amp ;

The && converts to &amp ;

This issue started few days ago everytime I save a page and come back to it i find all the & characters converted into  &amp ;

For example

  1.             r  =  Add_Material  [(Category = input.Category && Name != "")] sort by Category ;

would become

  1.             r  =  Add_Material  [(Category = input.Category && Name != "")] sort by Category ;

and what is worse if i make any changes to the page with the &amp ; i cant save it, i have to change it all back to & to save it!

Any help please